Question

${}_1{}^2\mathrm{H}\mathrm{and}{}_1{}^3\mathrm{H}$ are ________.

Answer 1

ISOTOPE: The isotopes of an element have the same atomic number but different atomic masses.

The difference in their masses is due to the presence of a different number of neutrons.

${}_1{}^2\mathrm{H}\mathrm{and}{}_1{}^3\mathrm{H}$ are isotopes.